Vat dye.



'cijystalline powders soluble in concentrated sulfuric acid ing (3hours.

the shape oi scarlebre eATe Pagan FrcE.

PAUL THOMASCI-IEWSKI, OF VOHWINKEL, NEAR ELBERFELD, GERMANY, ASSIGNOR TOFARBENFABRIKEN VORM. FRIEDR. PORA'IION F GER'MANY.

VAT DyE.

,1 chloroanthra(1ninone containing another anthraqninene radical thanthe authraquinone niercaptan.

'lhe new dyes being tlnoethers having most probably the formula:

R S R (It and It meaning two ditto-rent anthraqiunone radicals)aretron'i yellow to red generally with from a. yellow to blue to greencoloration.

ln order to illustrate the new process more fully the 'lollmvingexarnple is given, the parts being by weight:-- parts ofanthraquinone-2-mereaptan and parts ofl-benzoylamino-l-ehloroanthraquinone are boiled together with 10 partsof carbonate of potassium and parts of naphthalene durprecipitated withpyridin or alcohol. The precipitate is filtered off, washed with alco1101 and water.

The t benzoylamino 1.2 dianthraquincnylthioetl'ier having most probablythe formula:

i Nit-coca a 1 is after being dried and pulverized a red Specificationof Letters Patent.

The new thioether is then 1K vder erystallixing from nitrobemene inneedles which are i BAYER & (10., 0F ELBERFELI), GERMANY, A COR-Patented Nov. 19, 1912. 1912. Serial No. 686,349.

soluble in concentrated sulfuric acid with a green coloration and dyeingcotton from an alkaline hydrosultite vat yellowish-red shades fast tochlorin and to light.

()ther chloroanthraouinones or other an tln'aquinone mercaptans may beused. The dye obtained from 1-chloroanthraquinone andanthraquine-2-lnercaiptan dyes yellow, that obtained fromanthraquinone-Q- mercaptan and l.4-hroino-anthrapyridon dyesyellowish-red.

I claim 1. The herein described new rat dyes being thioethers of theanthraquinone series ha ring most probably the formula:

(It and It meaning two ditt'erent anthraquinone radicals) being solublein concentrated sulfuric acid with from a yellow to blue to greencoloration; and dyeing cotton from the hydrosultite vat generally fromyellow to orange to red fast shades, substantially as described.

The herein described new the t-benzoylan'iino-1.2'-diantliraquinonylt-hioether haying most probably the form ula Na-cocaa which is afterbeing dried and pulyerized a red powder crystallizing' from nitrobenzenein the shape of scarlet-red needles which are soluble in concentratedsnlt'uric acid with a green coloration; and dyeing cotton from analkaline hydrosnlfite vat yellowish-red fa. it shades, substantially asdescribed.

In testimony whereot I have hereunto setmy hand in the presence of twosubscribing witnesses.

PAUL raeniiseaawsm. 8-]

li itnesses llnm-m Norrie, 41.1mm NUFER.

vat dye being I

